We are mature adults, ask mature adult things!
Do you remember how you made friends back in elementary school? Just asked them what their favorite color (ours is green) or favorite dinosaur (ours is T-rex because that’s all we remember) is. Just like that, boom, instant BFFs until the very end.
Now, you have to ask more mature questions because, well, you’re older. For example, you can quiz your friend on basic chemistry and watch as they rethink their definition of “mature questions.” For this guy, it was a lot easier to just answer the original favorite-color question. Does anyone still remember what they learned in high school chem class?